Usage of Arraylists in Java

[Weasley]

Hello Friends,

I wrote a function yesterday, and defined an String array there. I
defined it like,

String[] arr = null;

No error was shown by my IDE. I thought to move ahead. But when I
tried to increase the size of my array, I was caught.

Now I learned the difference b/w Array & an Array List.

Read more .. http://www.ezdia.com/How_to_use_Array_List_in_Java/Content.do?id=1022

 

[John B. Matthews]

Perhaps you meant this:

<http://www.java-samples.com/showtutorial.php?tutorialid=234>

 

[Marcin Rze¼nicki]

Hello Friends,

I wrote a function yesterday, and defined an String array there. I
defined it like,

String[] arr = null;

No error was shown by my IDE.

Because there is no error in this line. Initializing reference to null
is always valid.

I thought to move ahead. But when I

tried to increase the size of my array, I was caught.

??

Now I learned the difference b/w Array & an Array List.

Read more ..http://www.ezdia.com/How_to_use_Array_List_in_Java/Content.do?id=1022

??

 

[Roedy Green]

String[] arr = null;

No error was shown by my IDE. I thought to move ahead. But when I
tried to increase the size of my array, I was caught.

Now I learned the difference b/w Array & an Array List.

That does not make sense. You did not allocate your array, so you
can't very well talk about increasing its size.

See http://mindprod.com/jgloss/array.html
http://mindprod.com/jgloss/arraylist.html